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-   -   What is the next B1? (https://www.mersenneforum.org/showthread.php?t=22112)

 ET_ 2017-03-06 09:35

What is the next B1?

I am focusing on ECM on Fermat numbers with mprime.

My question is: what is the next B1 range for F12, after 800,000,000?
I have heard people doing B1 = 2,900,000,000, is it correct?

 swellman 2017-03-06 12:33

[QUOTE=ET_;454361]I am focusing on ECM on Fermat numbers with mprime.

My question is: what is the next B1 range for F12, after 800,000,000?
I have heard people doing B1 = 2,900,000,000, is it correct?[/QUOTE]

[url]https://members.loria.fr/PZimmermann/records/ecm/params.html[/url]

 ET_ 2017-03-06 14:42

[QUOTE=swellman;454369][url]https://members.loria.fr/PZimmermann/records/ecm/params.html[/url][/QUOTE]

Thank you swellman. I was asking basicly for 2 reasons:

1 - I am using mprime, not GMP-ECM: mprime has different B2 parametrization.
2 - The page at [url]https://www.mersenne.org/report_ecm/[/url] based on mprime work over Fermat ecm shows B1 = 800,000,000 instead of 850,000,000.

Luigi

 swellman 2017-03-06 15:56

Sorry I missed the fact you're using mprime. Don't have optimal parameters for it, though I suspect they are close to gmp-ecm in magnitude. Good luck!

 henryzz 2017-03-06 16:21

If you are talking about optimal you would change the bounds after every curve.

Here is some reading
[url]http://www.mersenneforum.org/showthread.php?t=21420[/url]

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